![]() Lastly, the equivalent stress value of the bone-screw interface was calculated. Next, the vertebral fixation strength of a paired-screw construct was examined by applying forces simulating flexion, extension, lateral bending, and axial rotation to the vertebra. ![]() First, the fixation strength of a single screw was evaluated by measuring the axial pullout strength. The purpose of the present study was to evaluate the effect of screw size on fixation strength and to clarify the ideal size for optimal fixation using CBT.Ī total of 720 analyses on CBT screws with various diameters (4.5-6.5 mm) and lengths (25-40 mm) in simulations of 20 different lumbar vertebrae (mean age: 62.1 ± 20.0 years, 8 males and 12 females) were performed using a finite element method. ![]() Biomechanical studies have demonstrated the superior fixation capacity of CBT however, there is little consensus on the selection of screw size, and no biomechanical study has elucidated the most suitable screw size for CBT. The cortical bone trajectory (CBT) has attracted attention as a new minimally invasive technique for lumbar instrumentation by minimizing soft-tissue dissection. ![]()
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